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Lena-s Patent No. 63,142, dateaMarah 26, 1867.

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'To LL WHoM-Ir MAY concerteny Be it 'knoivn that I, CHARLES CRW, et" Onarga, in the' county of Iroquois-and Statev of Illinois, have invented a new and useful improvement' Yin Elevating and Extension Scaolds; and Ido hereby declare that the following isa full, clear, and exact description of the construction and operation of the same, reference. .being had to the annexed drawings, and letters of reference marked thereon, making a part of this specification, in whiche- I l j Figure 1 is a perspective representation of my scaiold.

Figure 2 is an elevation of v the jointed rack andpinion. j

Figure 3 isa transversesection of'theslides of one side ofthe machine.

'The nature of "my invention eons'ists,xfst, in'thel use of. jointed racks `for supporting the soaiiold frame, operated between jointed standards by'means ofpinions, som-ranged in convenienty positions that the'racks dan bd elevated or lowered.4 this means the scaffold can berun dotvn much lower than if the racks were made each of a single piece, for the jointed'parts can be turned outward 'as'the'racks' are run down, thus allowing thescatfold to. move a muchgreater'distaneexthan it'- the racks had no joints. Second, in supporting the jointed vstandards by means of sliding bars overlapping each other, and. secured in 'such a manner as to allow the scef. fold to' be spread apart or shut together torsuitthe situation in wlich'the scaol'd is used. The wliole construction comprises a portable scaffold, which .can be mounted upon Wheels, and conveyed to and from theplace Wherework is'tobe done in much l*less time than is usually employedn building temporary seaifolds, or in suspending the common swinging platforms from the roofslof buildings. And further, the seaiold. issuitahle Aand safe fdr supporting both workman and material when employed .either in painting, plastering, sign-'fastening' joincr-vorlc, and in all other kinds of business Where a suitable foundation is to be had andtoo great .an 'eleva` tion is not required.

A Brepresent'thc frames supporting the gearing E, an'd to `which are attached the 'jointed standards' in s) substantial manner, they' also beingsupported'by the horizontal ties G, which holdY them parallel.A 'H is .tho jointed racks, having the tongues J fitting into and runningin the grooves K niadein the sides ofthe 4sdzalldards F, forth-e purpose of guiding the ac k,as ist is run up and 'down, by`n`1eans of the pinionE. I shows lthe joints in the rack, made'for the purpose of lallowing sections to' be. turned-,outward when the soai'old is lowered, as.

-seen at fig. 2. By this means the platforms'L can 'be lowered down .far'enough to obviatel the -neoessityof a ladder for mounting up on to the top of it. Y And further, the scaffold isl as' strong' as if the joints I were not in the rack', for the upper joint cannot pass above top 'ol tho standards It lwill be seen the drawingsythat Vthere are double racks and-pinion's at each end ofthe scaiold, and that the pnions are madev fast to the' shafts P,-which have bearingsattachedf'to the top of the' frames- A. B. V shows the, upper sliding bars, which are attached to the upper end of the racks H, and support the platforms 2 shows'slots made in the'h'ars, through vrhich the large-headed bolts 1 pa: 1ss, ho ldingthe lap in such-a manner that the bars can be drawn' out or 'shut ltogether when it is necessary to lengthen vthe soafold when in use, or shorten it when conveying it from place to' place. The lowerbars U T are `fitted together by means Of-rabbets, and overlap similar to those at thetop, and can also be draivnou-t and shut together in the same mannen VWishoyvs joints made in the standards' F, in Aorder that the top of the. standardsmay be removed when itis: necessary to move theV scaffold into :zt-build'- ing, and in other cases where the standards 'would be too`high.. j j I Operation.

The platform L can'bieelevated or lowered byrturnin-gthe crank Q attached to Athe shafts P, and can be held up by means of the falls S-operating upon the -ratchets R. 'The standards F can be 'drawn out or shut together 'by hand force without diiculty, 'so as 'to -suit .the nature of -the work'tobe done. V

Having thus fully described my device, 4what I'clairnv as new, and desire toy secure by Letters Patentv of the United States, sv v 1. lhe combination of the jointed Vrack H, jointed standards F, andbars v, .when constructed to operate the platforms L, s ubstan'tially'as set lforth.

2. .The combination oftthe sliding bars 'l V'U' V,-platformsL, and frames A. B, substantially asset forth.

' l I 'CHARLES GROW. Witnesses L. A. McLEAN, 1. B. MAXWELL. 

